Design Of Water Flooding Development Project In Cengcha Area Of Wuqi Oilfield

According to the comprehensive analysis of the characteristics the chang61 reservoir deposition, structure, reservoir and reservoir distribution in Cengcha area of Wuqi oilfield, the chang61 reservoir distribution is mainly controlled by sedimentary characteristics, reservoir lithology and physical factors,and belongs to the composite lithologic reservoir and lithologic-structural reservoir. Due to poor reservoir property condition,tectonic structure development, the chang61 reservoir oil-water differentiation is not obvious, oil-water mixed store, no apparent oil-water interface, lack of edge and bottom water. The chang91 reservoir also belongs to the composite lithologic reservoir and lithologic-structural reservoir.The main production reservoir that is the chang61 reservoir can be seen, from productivity level classification of each layer production well. The production capacity of the chang6 reservoir in 41-248 well area is higher than 28-46 Wells area, The production capacity of the chang9 reservoir is higher than is higher. The chang6 production reservoir belongs to low porosity, ultra-low permeability reservoir. Due to helithology dense, small pore throat radius, Large seepage resistance, the well almost has no natural capacity. Most of the Wells are fracturing operation. Cengcha area of Wuqi oilfield is suitable for water injection development. Combined with geological characteristics of oil reservoir, water injection mode should be adopted to keep formation pressure in this area, in order to maximize oil field recovery, obtain the best economic benefits.Through reservoir engineering analysis, the existing well pattern is optimized. The injection-production pattern using 450-150 m irregular diamond-shape inverted nine-spot is suggested, local area which is not adjusted for inverted ninespot uses five point pattern for adjustment.